<template>
  <div id="home">
    <!-- 顶部导航 -->
    <nav-bar class="home-nav">
      <template #center>
        <div>购物街</div>
      </template>
    </nav-bar>

    <tab-control
        class="tab-control"
        :title="['流行', '新款', '精选']"
        @tabClick="tabClick"
        ref="tabControl1"
        v-show="isTabFixed"
      ></tab-control>

    <scroll class="content" 
    ref="scroll" 
    :probe-type="3" 
    @scroll="contentScroll"
    :pull-up-load ="true"
    @pullingUp="loadMore">
      <!-- 轮播图 -->
      <home-swiper :banner="banner" @swiperImageLoad = "swiperImageLoad" />
      <!-- 选项 -->
      <recommend-view :recommend="recommend" />
      <!-- 热门推荐 -->
      <feature-view></feature-view>
      <!-- 分类 -->
      <tab-control
        class="tab-control"
        :title="['流行', '新款', '精选']"
        @tabClick="tabClick"
        ref="tabControl2"
      ></tab-control>
      <!-- 商品列表 -->
      <goods-list :goods="showGoods" />
    </scroll>

    <back-top @click="backClick" v-show="isShowBackTop" />
  </div>
</template>

<script>
import NavBar from "../../components/common/navbar/NavBar";
import TabControl from "../../components/content/tabControl/TabControl";
import GoodsList from "../../components/content/goods/GoodsList";
import Scroll from "../../components/common/scroll/Scroll.vue";
import BackTop from "../../components/content/backTop/BackTop.vue";

import HomeSwiper from "./childComps/HomeSwiper";
import RecommendView from "./childComps/RecommendView";
import FeatureView from "./childComps/FeatureView";

import { getHomeMultidata, getHomeGoods } from "../../network/home";

export default {
  name: "Home",
  components: {
    NavBar,
    HomeSwiper,
    RecommendView,
    FeatureView,
    TabControl,
    GoodsList,
    Scroll,
    BackTop,
  },
  data() {
    return {
      banner: [],
      dKeyword: [],
      keywords: [],
      recommend: [],
      goods: {
        pop: { page: 0, list: [] },
        new: { page: 0, list: [] },
        sell: { page: 0, list: [] },
      },
      currentType: "pop",
      isShowBackTop:false,
      tabOffsetTop:0,
      isTabFixed: false,
      saveY:0,
    };
  },
  computed: {
    showGoods() {
      return this.goods[this.currentType].list;
    },
  },
  activated(){
    this.$refs.scroll.scrollTo(0,this.saveY,0);
  },
  deactivated(){
    this.saveY = this.$refs.scroll.y;
  },
  created() {
    // 请求多个数据
    this.getHomeMultidata();
    // 请求商品数据
    this.getHomeGoods("pop");
    this.getHomeGoods("new");
    this.getHomeGoods("sell");
  },
  methods: {
    //事件监听方法
    tabClick(index) {
      switch (index) {
        case 0:
          this.currentType = "pop";
          break;
        case 1:
          this.currentType = "new";
          break;
        case 2:
          this.currentType = "sell";
          break;
      }
      this.$refs.tabControl1.currentIndex = index;
      this.$refs.tabControl2.currentIndex = index;
    },
    backClick(){
      this.$refs.scroll.scrollTo(0,0,300);
    },
    contentScroll(position) {
      //BackTop是否显示
      this.isShowBackTop = -position.y > 1000;

      //tabControl是否吸顶
      this.isTabFixed = (-position.y) > this.tabOffsetTop;
    },
    loadMore() {
      this.getHomeGoods(this.currentType);
    },
    swiperImageLoad(){
      this.tabOffsetTop = this.$refs.tabControl2.$el.offsetTop;
    },


    //网络请求
    getHomeMultidata() {
      getHomeMultidata().then((res) => {
        this.banner = res.data.banner;
        this.dKeyword = res.data.dKeyword;
        this.keywords = res.data.keywords;
        this.recommend = res.data.recommend;
      });
    },
    getHomeGoods(type) {
      const page = this.goods[type].page + 1;
      getHomeGoods(type, page).then((res) => {
        this.goods[type].list.push(...res.data.list);
        this.goods[type].page += 1;
        this.$refs.scroll.finishPullUp();
      });
    },
  },
};
</script>

<style scoped>
.home-nav {
  background-color: var(--color-tint);
  color: #fff;
  position: fixed;
  left: 0;
  top: 0;
  right: 0;
  z-index: 9;
}

.tab-control {
  position: relative;
  z-index: 9;
}

#home {
  padding-top: 44px;
  height: 100vh;
  position: relative;
}

.content {
  position: absolute;
  overflow: hidden;
  top: 44px;
  bottom: 49px;
}
</style>